4 files changed, 73 insertions, 0 deletions
diff --git a/attr/dimensions.hpp b/attr/dimensions.hpp
new file mode 100644
index 0000000..9c1fda9
--- /dev/null
+++ b/attr/dimensions.hpp
@@ -0,0 +1,14 @@
+#ifndef MBUOY_ATTR_DIMENSIONS_HPP
+#define MBUOY_ATTR_DIMENSIONS_HPP
+
+namespace mbuoy {
+
+struct dimensions
+{
+    int width, height;
+};
+
+} // namespace mbuoy
+
+#endif // MBUOY_ATTR_DIMENSIONS_HPP
+
diff --git a/attr/ondraw.hpp b/attr/ondraw.hpp
new file mode 100644
index 0000000..d0932ef
--- /dev/null
+++ b/attr/ondraw.hpp
@@ -0,0 +1,21 @@
+#ifndef MBUOY_ATTR_ONDRAW_HPP
+#define MBUOY_ATTR_ONDRAW_HPP
+
+#include "position.hpp"
+#include "dimensions.hpp"
+
+namespace mbuoy {
+
+struct ondraw
+{
+    void (*func)(const position&, const dimensions&);
+
+    void operator()(const position& pos, const dimensions& dim) const noexcept {
+        func(pos, dim);
+    }
+};
+
+} // namespace mbuoy
+
+#endif // MBUOY_ATTR_ONDRAW_HPP
+
diff --git a/attr/position.hpp b/attr/position.hpp
new file mode 100644
index 0000000..dfb9cc7
--- /dev/null
+++ b/attr/position.hpp
@@ -0,0 +1,14 @@
+#ifndef MBUOY_ATTR_POSITION_HPP
+#define MBUOY_ATTR_POSITION_HPP
+
+namespace mbuoy {
+
+struct position
+{
+    int x, y;
+};
+
+} // namespace mbuoy
+
+#endif // MBUOY_ATTR_POSITION_HPP
+
diff --git a/attr/string.hpp b/attr/string.hpp
new file mode 100644
index 0000000..d7e1fcb
--- /dev/null
+++ b/attr/string.hpp
@@ -0,0 +1,24 @@
+#ifndef MBUOY_ATTR_STRING_HPP
+#define MBUOY_ATTR_STRING_HPP
+
+namespace mbuoy {
+
+template<int N>
+struct string
+{
+    consteval string(const char (&s_)[N]) {
+        for (int i = 0; i < N; ++i)
+            s[i] = s_[i];
+    }
+
+    consteval operator const char *() const {
+        return s;
+    }
+
+    char s[N];
+};
+
+} // namespace mbuoy
+
+#endif // MBUOY_ATTR_STRING_HPP
+